Tuesday, August 22, 2006

Exchange: Block Host IP From Sending E-Mail

Summary:

You identify a malicious host IP and wish to block all messages orginating from this host. For example Host A is sending a large volume of emails to your Exchange server. You want to block A's email IP address. If A resides in your ExchangeOrganization, A and your recipients will be MAPI clients. If A is a remote host from Internet, your recipients will be POP3 or IMAP4 clients.

Circumstance One===============If A is an internal client which resides in the same LAN, and you setRouting Group Connector to allow mail flow between two different sites,A will send email via the corresponding RGC. At this circumstance, youneed to restrict the RGC to prevent A from sending email. If you set aSMTP Connector but not RGC, A will send email via the corresponding SMTPVirtual Server. At this circumstance, you need to restrict the SMTPVS toprevent A from sending email.

Circumstance Two===============If A is an external client which comes from Internet, and you set SMTPVirtual Server to allow mail flow between your Exchange Organization andInternet, A will establish a SMTP session to your SMTPVS in order tosend emails to your Exchange Server. At this circumstance, you need toset the connection control on your SMTPVS to prevent A from sendingemail.

Note: You should disable the opening relay first.

Understanding the above information, we can perform the following stepsto block A's email IP address:

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